Flaming Käthchen: Is the Kalanchoe poisonous to cats?. Cats should not drink irrigation water - especially if fertilizer is dissolved in it.
If you notice the first signs of poisoning, you should immediately go to the nearest animal clinic or veterinarian. Many poisons take effect very quickly, which can endanger life in a short period of time. You can find even more exciting animal topics in the free partner newsletter from Landtiere.de, which you can subscribe to right here.